Whilst they're in the oven, fry up the onions and garlic in a non-stick pan with one spray of sunflower oil on a medium-high heat. Splash in the Hendersons and add in all the spices and black pepper. After three minutes, add in the lamb mince. Once the mince has browned off (after about 5 minutes usually), throw in the carrot, celery, red pepper, and mushrooms. 10 minutes later, stir in your tinned tomatoes and throw in your spinach. Let it all simmer whilst you wait for your aubergines to finish baking.